PSI - Issue 59

ScienceDirect Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2023) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2023) 000 – 000 Available online at www.sciencedirect.com Procedia Structural Integrity 59 (2024) 314–321

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

© 2024 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of DMDP 2023 Organizers Abstract The influence of a single tensile overload on the surface semi-elliptical cracks growth retardation of in semi-natural samples of low-alloy steel 09Mn2Si was considered. Experimental studies of tensile overloads influence on the surface cracks growth retardation were carried out, and the simulation of the surface cracks growth retardation was carried out using the specialized program AFGROW. A good convergence of the results obtained by the two methods was established. The delay in the surface cracks growth with different coefficients of their shape ratio was studied depending on the level of overloads, the range of the stress intensity factors of the main cycle, and stress ratio of the cycle. The regularities of the surface cracks growth under the influence of tensile overload have been established, depending on the specified factors. © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of DMDP 2023 Organizers Keywords: semi-elliptical surface crack; shape aspect ratio; cyclic loading; tensile overload; crack growth retardation. 1. Introduction During the operation of machines and structures, they are subjected to loads that often lead to instantaneous or monotonous changes in stress (Panasiuk (1990), Pіdgurskyi et al. (2018) ). The simplest manifestations of such Abstract The influence of a single tensile overload on the surface semi-elliptical cracks growth retardation of in semi-natural samples of low-alloy steel 09Mn2Si was considered. Experimental studies of tensile overloads influence on the surface cracks growth retardation were carried out, and the simulation of the surface cracks growth retardation was carried out using the specialized program AFGROW. A good convergence of the results obtained by the two methods was established. The delay in the surface cracks growth with different coefficients of their shape ratio was studied depending on the level of overloads, the range of the stress intensity factors of the main cycle, and stress ratio of the cycle. The regularities of the surface cracks growth under the influence of tensile overload have been established, depending on the specified factors. © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of DMDP 2023 Organizers Keywords: semi-elliptical surface crack; shape aspect ratio; cyclic loading; tensile overload; crack growth retardation. 1. Introduction During the operation of machines and structures, they are subjected to loads that often lead to instantaneous or monotonous changes in stress (Panasiuk (1990), Pіdgurskyi et al. (2018) ). The simplest manifestations of such VII International Conference “In -service Damage of Materials: Diagnostics and Prediction ” (DMDP 2023) Research of the Overloading Influence on the Propagation of Semi Elliptical Surface Cracks with Different Shape Configurations in Low-Alloy Steel Ivan Pidgurskyi a, *, Mykola Stashkiv a , Viktor Baranovsky a , Mykola Pidgurskyi a , Yurii Rudyak b , Taras Dubyniak a VII International Conference “In -service Damage of Materials: Diagnostics and Prediction ” (DMDP 2023) Research of the Overloading Influence on the Propagation of Semi Elliptical Surface Cracks with Different Shape Configurations in Low-Alloy Steel Ivan Pidgurskyi a, *, Mykola Stashkiv a , Viktor Baranovsky a , Mykola Pidgurskyi a , Yurii Rudyak b , Taras Dubyniak a a Ternopil Ivan Puluj National Technical University, 56 Ruska St., Ternopil 46001, Ukraine b I. Horbachevsky Ternopil National Medical University, 1 Maidan Voli, Ternopil 46001, Ukraine a Ternopil Ivan Puluj National Technical University, 56 Ruska St., Ternopil 46001, Ukraine b I. Horbachevsky Ternopil National Medical University, 1 Maidan Voli, Ternopil 46001, Ukraine

* Corresponding author. Tel.: +38(066) 837 27 31. E-mail address: ipidhurskyy@gmail.com * Corresponding author. Tel.: +38(066) 837 27 31. E-mail address: ipidhurskyy@gmail.com

2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of DMDP 2023 Organizers 2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of DMDP 2023 Organizers

2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of DMDP 2023 Organizers 10.1016/j.prostr.2024.04.045